Tube compression fitting and flared fitting used with connection body and method of making same

A tube fitting for use in combination with a thick-walled tube and a connection body, comprising:

• a sleeve in engagement with said thick-walled tube;
• said sleeve being generally cylindrically shaped and having a coating thereover;
• said sleeve includes a sharp annular biting portion engaging said thick walled tube;
• said sleeve includes an inner annular symmetric concavity;
• said concavity of said sleeve interengaging said thick-walled tube;
• said thick-walled tube includes an end portion;
• said end portion of said thick walled tube being flared;
• a gland about said thick-walled tube engageable with said sleeve, said gland including exterior threads thereon;
• a connection body;
• said connection body includes a frusto-conical portion;
• said connection body includes interior threads therein;
• said exterior threads of said gland interengaging said interior threads of said connection body, coupling said tube, said tube fitting and said connection body together;
• and, said flared end of said thick-walled tube interengaging and sealing against said frusto-conical portion of said connection body.

A process for making a tube fitting for use in combination with a thick-walled tube comprising the steps of:

• placing an end portion of a thick-walled tube into engagement with a tube engaging surface of a frusto-conical portion of a die such that the inner diameter of said tube interengages said tube engaging surface of said frusto-conical portion of said die, said die supported by a driving piston;
• sliding a sleeve over said tube, said sleeve includes an interior and an exterior, said exterior of said sleeve being having a coating thereover, said sleeve includes a sharp annular biting portion engaging said thick-walled tube, said sleeve includes an interior concavity, said concavity of said sleeve interengaging said thick-walled tube after deformation of said tube and said sleeve;
• securing said sleeve into forceful engagement with said die;
• driving said die into said thick-walled tube and said sleeve with said driving piston;
• flaring said end portion of said thick-walled tube;
• and, deforming said sleeve into engagement with said thick-walled tube.